The Transactional Outbox Pattern: Reliable Events Without Dual Writes

The complete guide to the transactional outbox pattern: why dual writes lose messages, how to store the event and the business data in a single transaction, a polling relay (FOR UPDATE SKIP LOCKED) and CDC with Debezium (full configuration, event router and slots). Covers per-aggregate ordering, relay scaling, the transactional inbox, retention and partitioning, observability, testing with Testcontainers, event versioning, claim check, multi-tenancy and a complete end-to-end pipeline case study. With production-ready SQL and Python.

36 minutes read

Josué García Puig

2026-07-10

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